The world number closed out the victory despite a few service wobbles late on, improving her win-loss record against Rybakina to 8-5.
Aryna Sabalenka exemplified consistency in 2025 and arrives for the November 1-8 tournament having retained her US Open title in September, after finishing runner-up to Madison Keys at the Australian Open and Coco Gauff at Roland Garros.
While off-court battles over pay and governance rumbled on, opportunities were scarce beyond the duopoly at the top of the men's game, leaving Djokovic to provide the year's standout moments for the chasing pack.
Earlier, Pegula secured a breezy 6-2, 6-3 victory over the already-eliminated Jasmine Paolini and said she would work out a strategy for her next opponent despite knowing there was a slim chance of an exit if Gauff prevailed in three sets.
Ons Jabeur gained revenge for her defeat in last year's final when she surged back to beat third-seeded defending champion Kazakh Elena Rybakina.
Mboko saved a match point against Kazakh ninth seed Rybakina in front of adoring home support
Mboko, currently ranked 85th in the world, became the first Canadian to defeat three former Grand Slam champions in a single WTA event in the Open Era, with victories over Sofia Kenin, Coco Gauff and Elena Rybakina.
'I had a deja vu moment on court. I had match point on the same side of the court, went for the same serve and was telling myself the same things. I had goosebumps, it was really special. It's great to win here again.'
Aryna Sabalenka got the revenge she craved on Friday by defeating Leylah Fernandez to erase the sting of her 2021 US Open semi-final upset.
Anna Kalinskaya outclassed Britain's Emma Raducanu at the Washington Open on Saturday to advance to the final, where she will face Leylah Fernandez.
Aryna Sabalenka showed nerves of steel and champion's resolve to defeat Elena Rybakina in their Berlin Open quarter-final on Friday, saving four match points in the final-set tiebreak.
Elena Rybakina powered into her first Cincinnati Open semi-final after stunning defending champion Aryna Sabalenka 6-1, 6-4 on Friday, while five-times Grand Slam champion Carlos Alcaraz recovered from a second-set blip to beat Andrey Rublev.
With two match wins in total in his last four Grand Slams, Tsitsipas has turned to the former coach of Novak Djokovic to turn his fortunes around.
'We heard it was like the Hollywood of mixed doubles.'
Emma Raducanu beat four-time Grand Slam champion Naomi Osaka 6-4, 6-2 in their first career meeting to reach the quarter-finals of the Washington Open on Thursday.
Fifth seed Iga Swiatek stages revival to stay in hunt for 4th French crown.
World number two Gauff clawed her way back from a set down to defeat Russian Veronika Kudermetova 4-6, 7-5, 6-2 in a match that stretched over two and a half hours.
Playing in only her second singles match of the year, Bouchard blasted a forehand winner to take the first set but Colombian Arango turned the tables in the second set amid a cascade of unforced errors from her opponent.
Aryna Sabalenka returns to the US Open as the reigning champion and bookmakers' favourite, but her 2025 season has been anything but smooth sailing.
President Vladimir Putin has thanked Palestinian group Hamas for releasing three Russian hostages captivated during the October 2023 attack on Israel.
Alexander Zverev rallied from a set down to beat defending champion Alexei Popyrin in Toronto and move into the semi-finals.
Third seed Iga Swiatek will play against Italy's Jasmine Paolini in her first Cincinnati Open final.
Michelsen, seeded 26th, will face hard-hitting 11th seed Karen Khachanov of Russia, who upset eighth seed Casper Ruud in their fourth round match 6-4, 7-5.
Goran Ivanisevic gave a scathing assessment of Stefanos Tsitsipas, saying he has "never seen a more unprepared player" in his life.
Defending champion Krejcikova edges Dolehide to move into third round at Wimbledon 2025
American lucky loser Reilly Opelka put up an intense battle to stun top seed Daniil Medvedev 7-6(5), 7-6(5) and reach the Libema Open semi-finals in Den Bosch on Friday.
Canadian Open champion Shelton was locked in an entertaining contest with Frenchman Adrian Mannarino in the day's opening match on Louis Armstrong Stadium when his tournament suddenly unravelled.
Shelton blasted an ace on match point to seal the win and avenge his five-set loss to Tiafoe at last year's U.S. Open as the 22-year-old continues to make strides in his breakout season.
Carlos Alcaraz, who advanced to the last eight in Cincinnati for the third time, has now won 36 of his last 38 matches.
American lucky loser Reilly Opelka put up an intense battle to stun top seed Daniil Medvedev 7-6(5), 7-6(5) and reach the semi-finals in Den Bosch on Friday.
World number one Aryna Sabalenka reached the last 16 at the Miami Open when Elena-Gabriela Ruse retired injured on Saturday, while men's top seed Alexander Zverev beat Jacob Fearnley 6-2, 6-4 to reach the third round.
Sania Mirza entered the Wimbledon doubles semi-finals for the first time in her career after she and Elena Vesnina rallied from a set down to beat the unseeded pair of Nuria Llagostera Vives and Arantxa Parra Santonja of Spain in the quarter-finals on Wednesday. The fourth seed Indo-Russian pair won 3-6, 6-4, 7-5.
Carlos Alcaraz demolished Mattia Bellucci to banish memories of last year's shock early exit at the US Open on Wednesday.
Naomi Osaka tumbled out of the Berlin Open first round on Tuesday
Aryna Sabalenka inched closer to becoming the first woman since Serena Williams (2012-14) to win consecutive US Open titles.
IMAGES from the French Open played at Roland Garros, in Paris, France, on Sunday.
Belgian third seed Elise Mertens dug deep to save 11 match points and battle past two-time winner Ekaterina Alexandrova to reach the Libema Open final.
MERTENS OVERPOWERS RUSE TO WIN FIRST GRASS TITLE
Maria crowned first Queen's Club women's champion in 52 years
